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Contents Vol.28, No.8; August 2015 SILICON CHIP www.siliconchip.com.au Features 16 A Look At Biohacking Biohacking is a relatively new phenomenon and ranges from the simple and familiar to the bizarre. Here’s a quick rundown – by Dr David Maddison 26 Nikon’s Incredible P900 Camera It’s got an 83x optical zoom lens and gives impressive results – by Kevin Poulter Nikon’s Incredible P900 Camera With 83x Zoom Lens – Page 26. 45 DMM Calibration Do you trust your multimeter? Now you can use our Voltage/Resistance/Current Reference to check and calibrate it – by Nicholas Vinen 48 Battery Fighters Won’t Leave You Stranded Don’t let a flat battery leave you stuck out the back of Woop Woop – Ross Tester 50 Review: Keysight 34470A 7.5-Digit Multimeter It boasts high measurement precision, a 4.3-inch LCD, standard USB and Ethernet ports, high-speed data logging modes and more – by Nicholas Vinen 62 Electronex: The Electronics Design & Assembly Expo Electronex returns to Melbourne from 9-10th September 96 Here is Me – And Here is Mini-Me! Fancy a 3D version of your mini-self? In paper, plastic or resin? Mini-Me 3D scanning and printing is being introduced at Officeworks – by Kevin Poulter Pro jects To Build 32 Ultra-LD Mk.4 200W RMS Power Amplifier, Pt.1 Our new Ultra-LD Mk.4 has even lower distortion than the Mk.3 version, is more compact and now includes a LED clipping indicator – by Nicholas Vinen Ultra-LD Mk.4 200W RMS Power Amplifier, Pt.1 – Page 32. Accurate Voltage/ Current/ Resistance Reference – Page 40. 40 Accurate Voltage/Current/Resistance Reference This low-cost, accurate voltage, current and resistance reference is just the shot for checking and calibrating multimeters – by Nicholas Vinen 66 Build A Driveway Monitor, Pt.2 Part 2 this month has the full construction and installation details. You can build it to operate just the way you want – by John Clarke Build A Driveway Monitor, Pt.2 – Page 66. 84 LED Party Strobe Mk2 It’s based on a standard 230VAC 30W LED floodlight which can be purchased quite cheaply. You just build a small PCB module to control it – by Ross Tester Special Columns 76 Circuit Notebook (1) PICAXE-Based Mains Timer; (2) Simple Solar Charge Regulator For Campers; (3) Simple Switchmode LED Flasher 89 Serviceman’s Log My love/hate relationship with cars – by Dave Thompson 98 Vintage Radio The 1955 Fleetwood 4-Valve 1003 – by Associate Professor Graham Parslow Departments 2 Publisher’s Letter   4 Mailbag siliconchip.com.au 61 Product Showcase 104 SC Online Shop 106 111 112 112 Ask Silicon Chip Market Centre Advertising Index Notes & Errata Build A LED Party Strobe – Page 84. April 2015  1 August 2015 2015     1 1